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Segment Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 26, 2019
USD ($)
Sep. 27, 2018
USD ($)
Sep. 26, 2019
USD ($)
segment
Sep. 27, 2018
USD ($)
Segment Reporting Information [Line Items]        
Cost of Goods and Services Sold $ 1,647.6 $ 1,543.1 $ 5,029.1 $ 4,601.3
Segment Revenues        
Segment Revenues 1,919.9 1,813.7 5,903.8 5,386.7
Segment Operating Income        
Business Segment Operating Income 272.7 270.9 865.0 788.0
Segment Information Unallocated Corporate Selling General And Administrative (53.6) (37.3) (173.6) (154.5)
Segment Information Unallocated Research And Development (12.6) (10.8) (36.0) (31.3)
Segment Information Unallocated Cost Of Sales (0.4) (0.3) 9.7 (2.6)
Operating income 206.1 222.5 $ 665.1 599.6
Segment Reporting Information, Additional Information [Abstract]        
Number Of Principal Segments | segment     3  
Percentage Of Net Revenue Derived From Two Largest Customers     95.00%  
Fuselage Systems [Member]        
Segment Revenues        
Segment Revenues 1,005.3 991.0 $ 3,171.7 2,983.4
Segment Operating Income        
Business Segment Operating Income 105.8 134.8 380.5 417.7
Propulsion Systems [Member]        
Segment Revenues        
Segment Revenues 520.9 442.4 1,525.5 1,259.6
Segment Operating Income        
Business Segment Operating Income 111.7 76.2 304.9 203.9
Wing Systems [Member]        
Segment Revenues        
Segment Revenues 391.0 378.6 1,197.4 1,138.6
Segment Operating Income        
Business Segment Operating Income 53.9 58.6 177.1 166.1
Other Systems [Member]        
Segment Revenues        
Segment Revenues 2.7 1.7 9.2 5.1
Segment Operating Income        
Business Segment Operating Income $ 1.3 $ 1.3 $ 2.5 $ 0.3